CN103140887B - The image processing method of liquid-crystal display - Google Patents

The image processing method of liquid-crystal display Download PDF

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Publication number
CN103140887B
CN103140887B CN201180046550.1A CN201180046550A CN103140887B CN 103140887 B CN103140887 B CN 103140887B CN 201180046550 A CN201180046550 A CN 201180046550A CN 103140887 B CN103140887 B CN 103140887B
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Prior art keywords
image
interpolation
shake
module
determines
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Expired - Fee Related
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CN201180046550.1A
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CN103140887A (en
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潘昊
冯晓帆
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Sharp Corp
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Sharp Corp
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/068—Adjustment of display parameters for control of viewing angle adjustment
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2044—Display of intermediate tones using dithering

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Image Processing (AREA)

Abstract

The image processing method of a kind of liquid-crystal display comprises determines shake image and interpolation image based on this image. By these two image blend to form the vision-mix shown on the display.

Description

The image processing method of liquid-crystal display
Technical field
Present invention relates in general to image contracting put, the contracting particularly relating to the liquid-crystal display based on visual angle is put.
Background technology
Along with the resolving power of display equipment is more and more higher, it is desirable to the input picture of low resolution is zoomed to high-resolution with on the indicating meter being displayed in high-resolution. Such as, have 1000 × 2000 pixels resolving power image should scaled 2 times with on the indicating meter being suitably displayed in 2000 × 4000 pixels. Such as, have 500 × 1000 pixels resolving power image should scaled 4 times with on the indicating meter being suitably displayed in 2000 × 4000 pixels.
For the many zoom technology by being transformed into high-resolution on image based on interpolation. Technology based on interpolation fills, with the use of space existing in input content and/or space-time characteristic, the pixel lacked. Such as, edge-oriented (edge-oriented) technology keeps the smoothness at edge in input content after upper conversion. Other technologies can utilize and realize higher spatial resolution and relatively lower noise and artifact in the output after upper conversion of the redundancy in multiple input frame and complementary information.
Although the Design and manufacture of liquid-crystal display is improving always, but they still tend to have viewing angle color dependency. It is believed that the normal visual angle of the image shown by using is as benchmark, when watching from the angle of off-normal, there is look and move and contrast gradient decline in shown image. Visual angle of liquid crystal display dependency depends on this fact of visual angle by the transmissivity of liquid-crystal display to cause.
Use dither technique can reduce the view angle dependency of liquid-crystal display. Dither technique typically transmissivity based on not all gray-scale value all there is identical this observation of view angle dependency level. The transmissivity of dark value and bright gray-scale value typically has the view angle dependency level lower than intermediate value. Typically, when an image is displayed, therefore, by avoiding using intermediate grey values can improve the visual angle of liquid-crystal display. In order to show single pixel, it may also be useful to usually have the multiple immediate pixel of the consistent mean value of pixel single with this. But, it may also be useful to this kind based on the R&D-based growth of shake in the spatial resolution significantly reducing indicating meter. In addition, in the high-resolution areas of indicating meter, the loss of spatial resolution may be remarkable especially.
Consider following detailed description of the present invention in conjunction with the drawings, it is possible to more easily understand above and other object, the feature and advantage of the present invention.
Summary of the invention
The present invention provides the image processing method of a kind of liquid-crystal display.
In one aspect of the invention, the method comprises: (a) determines shake image based on described image; B () determines interpolation image based on described image; (c) at least based on image described in color analysis and determine scalar value β; D described shake image is mixed to form the vision-mix shown on the display with described interpolation image by () based on described scalar value β, β is the arbitrary value from 0 to 1, and described vision-mix is β doubly described shake image and (1-β) doubly described interpolation image sum.
Consider following detailed description of the present invention in conjunction with the drawings, it is possible to more easily understand above and other object, the feature and advantage of the present invention.
Accompanying drawing explanation
Fig. 1 illustrates the panntographic system comprising shake module, interpolation module, analysis module, viewing person's spacing module and mixing module.
Fig. 2 illustrates that space contracting is put.
Fig. 3 illustrates interpolation module.
Fig. 4 illustrates shake module.
Fig. 5 illustrates LCD transmittance.
Fig. 6 illustrates mixing module.
Embodiment
The resolving power of the Input Image Content of many digital video discs is 720 × 480 pixels. Although this content does not have the resolving power equally high with the resolving power (such as, 1920 × 1080 pixel resolutions) of blue light digital video disc, but when showing over the display, concerning viewing person, this content still looks nice. In many cases, the high-resolution that image content is upwards zoomed to the resolving power with indicating meter and mates, in the case, this image has the picture quality improved a little. But, along with display quality improves constantly, add the input of relative high quality, as the result upwards contracting and putting, the raising of visual quality is subject to some restrictions.
Although along with the improvement of display design, view angle dependency may trend towards reducing, but view angle dependency is still quite big. The resolving power of the increase of indicating meter can not trend towards significantly reducing view angle dependency.
It has been determined that comprise the image-region of some feature, as skin color region and usually equal one region, it is preferable that do not carry out the amendment of significant visual angle susceptibility because in these regions color amendment be easily noted. Therefore, it should in the way of suitable, these regions are shaken, thus reduce view angle dependency. In contrast, also it has been determined that comprise the image-region of other features, such as high-frequency region, high texture region, region, edge, it is preferable that do not carry out big shake, because the amendment of the spatial resolution in these regions is easily noted. Therefore, it should to these REGION INTERPOLATION in the way of suitable, thus reduce the loss of spatial resolution.
Even if in order to when watching indicating meter from the direction of deviation angle, also the overall appearance of indicating meter is improved, it is desirable to subtract by making the visual angle of deviation angle and damage significant especially region and image is revised in the significant especially region shake of interpolation loss of spatial resolution. Therefore, image modification technique not only should consider the space in input content, time and/or space-time characteristic, but also should be considered as the visual angle of liquid crystal display display characteristic of the result of input content. Therefore, it should input picture is optionally applied interpolation technique and dither technique. In addition, this system can utilize the visual characteristics of viewing person, such as the viewing distance to indicating meter, puts to revise the contracting applied further.
With reference to figure 1, panntographic system can comprise shake module 100, interpolation module 110, first mixes module 120, analysis module 130, viewing person's distance detection module 140 and the 2nd mix module 150. Interpolation module 110 uses any suitable space, time and/or space-time interpolation technique upwards to contract and puts input picture. As shown in Figure 2, interpolation module 110 preferably inputs a pixel of this input picture (having the resolving power of M × N), and four pixel ul, ur, dl and dr are outputted to the resolving power that interpolation image 190(has 2M × 2N).
With reference to figure 3, Fig. 3, an exemplary interpolation module 110 is shown.The technology of interpolation module 110 determines interpolation image 190 based on the space interpolation based on edge. That is, the technology of interpolation module 110 only carries out the edge-oriented interpolation in space. It uses input pixel to be positioned at 5 × 5 windows at center. In each 5 × 5 window, this technology inputs the edge direction of pixel based on brightness Y Composition Estimation, and produces the reliability score α of the edge direction estimated. Then this technology along the edge direction estimated with each RGB color passage interpolation three new pixels (ul, ur, dl). This technology uses linear interpolation as standby technology. Finally, based on reliability score α, above-mentioned two interpolation results are mixed to produce final four output pixel. Like this, this technology determines interpolation image 190.
Shake module 100 uses any suitable dither technique amendment input picture, and determines shake image 180. As shown in Figure 2, shake module 100 inputs a pixel of this input picture (having the resolving power of M × N), and four pixel ul, ur, dl and dr are outputted to the resolving power that shake image 180(has 2M × 2N). First input pixel application gamma is corrected 200 by the exemplary dither technique shown in Fig. 4, so that it is transformed into linear domain from the code value domain based on gamma. Then this pixel is used as using the basis searching table 210, to produce four pixel values at ul, ur, dl and dr respectively. Then these four pixels are through inverse gamma correction 220, to be converted back to the code value domain based on gamma from linear domain. Like this, shake module 100 and determine shake image 180. Three can be used to search table to realize gamma correction 200, to shake searching table 210 and inverse gamma correction 220, search table for these three and use the displays of target indicator to estimate. Shake module 100 can act on multiple input pixel equally, and provides multiple output pixel. In general, shake module 100 what improve visual angle reduces spatial resolution simultaneously. Therefore, described shake image 180 has the view angle dependency of reduction. But, interpolation image 190 can have the view angle dependency lower than shake image 180.
Fig. 5 illustrates at two visual angles, that is, 0 degree and 45 degree, records and the LCD transmittance of normalized LCD display. These two transmittance graphs illustrate that the transmissivity of intermediate grey values depends on visual angle than bright more with dark value. Based on this measurement, shake is searched table and (or minimizing) should be avoided to use the middle level in output pixel. In addition, the mean value that table can utilize usually identical with the value of the input pixel in linear domain output pixel is searched in shake.
Mixing module 120 maps 160 based on the β from image analysis module 130 and optionally the shake image 180 from shake module 100 and the interpolation image 190 from interpolation module 110 is mixed. Mixing module 120 inputs shake image 180(from shake module 100, there is the resolving power of 2M × 2N) one or more pixels, interpolation image 190(is from interpolation module 110, there is the resolving power of 2M × 2N) one or more pixel and β map 160(from analysis module 130, there is the resolving power of M × N). Then the pixel that module 120 exports the vision-mix 170 with 2M × 2N resolving power is mixed.
With reference to figure 6, Fig. 6, exemplary mixing module 120 is shown. The technology of mixing module 120 mixes shake image 180 and interpolation image 190 based on scalar value β.This technology can be characterized as being: image=β * shakes image+(1-β) * interpolation image, and wherein β is the arbitrary value from 0 to 1.
Analyze module 130 based on the such as signature analysis such as color and gradient input picture, and export β and map 160. β maps the resolving power that 160 can have M × N, and each β is the scalar between 0 and 1. In two extreme values, 0 represents the shake being not suitable for upper conversion completely, and 1 represents the shake being suitable for upper conversion completely. This β maps to produce can to use any suitable technology, maps as used Skin score and maps as this β. The β that Skin score is suitable measures, because viewing person is responsive to changing the skin color change caused due to visual angle, and skin area is normally smooth. Any suitable technology can be used to produce this Skin score.
Mixing module 120 can form vision-mix 170 based on viewing person to the determination of the distance of this indicating meter. In the case, viewing person's distance detection module 140 can detect the distance of viewing person to this indicating meter. If viewing person is near screen, then preferably avoid or reduce the dither pattern that viewing person easily sees. Viewing person's distance detection module 140 exports bigger value in the region that should reduce shake so that mixing module 150 trends towards using interpolation image 190. If viewing person is not near this indicating meter, then this module exports low value so that mixing module 150 trends towards using vision-mix 170.
In another embodiment, shake module and can recognize edge. The value of edge trends towards bright with dark. Therefore, shake module and can determine shake image based on the use dither pattern (ditheringpattern) corresponding with each edge in image further. By selecting the value of the general dither pattern mated with third edge pattern, visual angle will increase, and the spatial resolution of image by maintenance or can not reduce a lot simultaneously.
(or contrary) interpolation image and shake image can be produced based on hybrid cytokine pixel by pixel so that do not need all pixels carry out interpolation and mixing. In addition, it is possible in a single operation, complete the interpolation based on hybrid cytokine and shake.
The term that adopts in more than illustrating and express and be used as descriptive term instead of restrictive at this, and be not intended to when using these terms and express to get rid of shown and feature that is that describe or its part etc. jljl, it will be appreciated that the scope of the present invention is only defined by claims and limits.

Claims (14)

1. an image processing method for liquid-crystal display, comprising:
A () determines shake image based on described image;
B () determines interpolation image based on described image;
(c) at least based on image described in color analysis and determine scalar value β;
D described shake image is mixed to form the vision-mix shown on the display with described interpolation image by () based on described scalar value β,
β is the arbitrary value from 0 to 1,
Described vision-mix is β doubly described shake image and (1-β) doubly described interpolation image sum.
2. method according to claim 1, wherein said shake image has the view angle dependency of reduction.
3. method according to claim 1, wherein said shake image is applied to the different zones of described indicating meter.
4. method according to claim 1, wherein said shake image is not applied to whole described image.
5. method according to claim 1, wherein said interpolation image is applied to the different zones of described indicating meter.
6. method according to claim 1, wherein said interpolation image is not applied to whole described image.
7. method according to claim 1, wherein said determines that described interpolation image is only based on space interpolation.
8. method according to claim 1, wherein said determines that described interpolation image is only based on temporal interpolation.
9. method according to claim 1, wherein said determines described interpolation image only based on space-time interpolation.
10. method according to claim 1, wherein said determine described interpolation image based on: based on the space interpolation at edge.
11. methods according to claim 1, wherein said determine that described shake image also uses and search table.
12. methods according to claim 1, wherein said shake image is also based on using the dither pattern corresponding with each edge in described image.
13. methods according to claim 1, wherein β is based on Skin score.
14. methods according to claim 1, wherein said vision-mix also arrives the determination of the distance of described indicating meter based on viewing person.
CN201180046550.1A 2010-09-30 2011-09-27 The image processing method of liquid-crystal display Expired - Fee Related CN103140887B (en)

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US12/894,501 US20120081388A1 (en) 2010-09-30 2010-09-30 Scaling for a lcd based upon viewing angle
US12/894,501 2010-09-30
PCT/JP2011/072709 WO2012043846A1 (en) 2010-09-30 2011-09-27 A method for image processing for a liquid crystal display

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WO2021118575A1 (en) * 2019-12-12 2021-06-17 Google Llc Viewing-angle-dependent color/brightness correction for display system

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US20120081388A1 (en) 2012-04-05
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